4.11.3.e Rich mix
A rich mixture is a mixture that has a significant lack of air compared to the normal amount. In such a mixture, due to a lack of oxygen, gasoline is not burned completely. This causes a decrease in engine power with significant fuel consumption. Unburned fuel particles in the form of carbon deposits are partially deposited inside the cylinders, and their main part is thrown into and out of the exhaust pipe in the form of black smoke.
Pops and shots are created as a result of the afterburning of unburned fuel inside the exhaust pipe. This is an external sign of a strong enrichment of the mixture.
Based on the considered properties of various compositions of the combustible mixture, it can be concluded that if the engine, according to the operating conditions, should not develop full power (at medium loads), the diluted mixture is the most advantageous, since fuel consumption will significantly decrease. The resulting decrease in engine power during operation at partial load does not matter. At high loads, it is more expedient to work on an enriched mixture, since the engine develops the greatest power at the same time. A slightly increased fuel consumption due to the short-term operation of the engine in this mode does not cause a noticeable increase in total consumption over a long period of time.
Running on a lean or rich mixture, which will reduce the power and economy of the engine, is unacceptable.
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